pre-grinding hob

例句：

1. 1. The engineer used the pre-grinding hob to prepare the surface for painting.
   工程师使用预磨砂轮来准备表面以便上漆。
2. 2.The machine tool is equipped with a pre-grinding hob that can quickly remove rust and dirt.
   这台机床配备了一个预磨砂轮，可以快速去除锈迹和污垢。
3. 3. The pre-grinding hob was essential for the precision work required in this manufacturing process.
   预磨砂轮对于这个制造过程中所需的精密工作至关重要。